التفاصيل البيبلوغرافية
| العنوان: |
Catalytic degradation of chlorinated volatile organic compounds (CVOCs) over Ce-Mn-Ti composite oxide catalysts. |
| المؤلفون: |
Zhou, Zhiwei1,2,3 (AUTHOR), Li, Qianqian1,2,3 (AUTHOR) qqli@rcees.ac.cn, Su, Guijin1,2,3 (AUTHOR), Pang, Jiaxin2,3 (AUTHOR), Sun, Bohua2,3 (AUTHOR), Meng, Jing2,3 (AUTHOR), Shi, Bin2,3 (AUTHOR) |
| المصدر: |
Journal of Environmental Sciences (Elsevier). Apr2024, Vol. 138, p326-338. 13p. |
| مصطلحات موضوعية: |
VOLATILE organic compounds, CERIUM oxides, CATALYSTS, CATALYTIC oxidation, DOPING agents (Chemistry), CHARGE exchange |
| مستخلص: |
Developing industrially moldable catalysts with harmonized redox performance and acidity is of great significance for the efficient disposal of chlorinated volatile organic compounds (CVOCs) in actual exhaust gasses. Here, commercial TiO 2 , typically used for molding catalysts, was chosen as the carrier to fabricate a series of Ce 0.02 Mn 0–0.24 TiO x materials with different Mn doping ratios and employed for chlorobenzene (CB) destruction. The introduction of Mn remarkedly facilitated the synergistic effect of each element via the electron transfer processes: Ce3++Mn4+/3+↔Ce4++Mn3+/2+ and Mn4+/3++Ti4+↔Mn3+/2++Ti3+. These synergistic interactions in Ce 0.02 Mn 0.04–0.24 TiO x , especially Ce 0.02 Mn 0.16 TiO x , significantly elevated the active oxygen species, oxygen vacancies and redox properties, endowing the superior catalytic oxidation of CB. When the Mn doping amount increased to 0.24, a separate Mn 3 O 4 phase appeared, which in turn might weaken the synergistic effect. Furthermore, the acidity of Ce 0.02 Mn 0.04–0.24 TiO x was decreased with the Mn doping, regulating the balance of redox property and acidity. Notably, Ce 0.02 Mn 0.16 TiO x featured relatively abundant B-acid sites. Its coordinating redox ability and moderate acidity promoted the deep oxidation of CB and RCOOH- intermediates, as well as the rapid desorption of Cl species, thus obtaining sustainable reactivity. In comparison, CeTiO x owned the strongest acidity, however, its poor redox property was not sufficient for the timely oxidative decomposition of the easier adsorbed CB, resulting in its rapid deactivation. This finding provides a promising strategy for the construction of efficient commercial molding catalysts to decompose the industrial-scale CVOCs. [Display omitted] [ABSTRACT FROM AUTHOR] |
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